Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/23008
If the perf diff is big, let's don't change but document that we can use
`CloudPickleSerializer()` to avoid breaking change.
If the perf diff is rather trivial, let's check if we can keep this change.
I will help to check the perf in this case as well.
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